The MMDDT criterion, also called maximum safety margin (MSM) criterion or constructive interference (CI) criterion, have been receiving great attention of the community. In [1]} different a constant envelope designs have been proposed based on the MMDDT criterion under per-antenna-power constraint. In [2]} the MMDDT criterion is also utilized this time under the convex hull constraint. In [3]} and [4]} different greedy-search (GS) algorithms were developed using the MMDDT criterion for the 1-bit case with PSK modulation. The work from [4]} is extended in [6]} for QAM modulation. In [7]} a partial B&B algorithm was considered in the context of PSK signaling for the 1-bit case. In [8]} a B&B technique is utilized to compute the optimal MMDDT precoding vector also for the 1-bit case. Finally, the study from [9]} generalizes the work from [8]} for phase quantization with an arbitrary number of bits.
